/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.activej.dataflow.calcite;

import io.activej.common.builder.AbstractBuilder;
import io.activej.dataflow.calcite.table.AbstractDataflowTable;
import org.apache.calcite.schema.Table;
import org.apache.calcite.schema.impl.AbstractSchema;
import org.apache.calcite.util.NameSet;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;

import static io.activej.common.Checks.checkArgument;

public final class DataflowSchema extends AbstractSchema {
	private final Map<String, AbstractDataflowTable<?>> tableMap = new TreeMap<>(NameSet.COMPARATOR);

	private DataflowSchema() {
		super();
	}

	public static Builder builder() {
		return new DataflowSchema().new Builder();
	}

	public final class Builder extends AbstractBuilder<Builder, DataflowSchema> {
		private Builder() {}

		public Builder withTable(AbstractDataflowTable<?> table) {
			checkNotBuilt(this);
			AbstractDataflowTable<?> prev = tableMap.put(table.getTableName(), table);
			checkArgument(prev == null, "Duplicate table names: " + table.getTableName());
			return this;
		}

		public Builder withTables(Collection<AbstractDataflowTable<?>> tables) {
			checkNotBuilt(this);
			for (AbstractDataflowTable<?> table : tables) {
				String tableName = table.getTableName();
				AbstractDataflowTable<?> prev = tableMap.put(tableName, table);

				checkArgument(prev == null, "Duplicate table names: " + tableName);
			}
			return this;
		}

		@Override
		protected DataflowSchema doBuild() {
			return DataflowSchema.this;
		}
	}

	@Override
	protected Map<String, Table> getTableMap() {
		return Collections.unmodifiableMap(tableMap);
	}

	public Map<String, AbstractDataflowTable<?>> getDataflowTableMap() {
		return Collections.unmodifiableMap(tableMap);
	}
}
